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首页> 外文期刊>Journal of chromatography, A: Including electrophoresis and other separation methods >Salt effects in electromembrane extraction
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Salt effects in electromembrane extraction

机译：盐在电膜萃取中的作用

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Electromembrane extraction (EME) was performed on samples containing substantial amounts of NaCl to investigate how the presence of salts affected the recovery, repeatability, and membrane current in the extraction system. A group of 17 non-polar basic drugs with various physical chemical properties were used as model analytes. When EME was performed in a hollow fiber setup with a supported liquid membrane (SLM) comprised of 2-nitrophenyl octyl ether (NPOE), a substantial reduction in recovery was seen for eight of the substances when 2.5% (w/v) NaCl was present. No correlation between this loss and the physical chemical properties of these substances was seen. The recovery loss was hypothesized to be caused by ion pairing in the SLM, and a mathematical model for the extraction recovery in the presence of salts was made according to the experimental observations. Some variations to the EME system reduced this recovery loss, such as changing the SLM solvent from NPOE to 6-undecanone, or by using a different EME setup with more favorable volume ratios. This was in line with the ion pairing hypothesis and the mathematical model. This thorough investigation of how salts affect EME improves the theoretical understanding of the extraction process, and can contribute to the future development and optimization of the technique.
机译：对包含大量NaCl的样品进行电膜萃取（EME），以研究盐的存在如何影响萃取系统中的回收率，可重复性和膜电流。一组具有各种物理化学性质的17种非极性碱性药物被用作模型分析物。当在具有由2-硝基苯基辛基醚（NPOE）组成的支撑液膜（SLM）的中空纤维装置中进行EME时，当NaCl为2.5％（w / v）时，八种物质的回收率显着降低。当下。这种损失与这些物质的物理化学性质之间没有相关性。假设回收损失是由SLM中的离子对引起的，并根据实验观察结果建立了存在盐时提取回收率的数学模型。 EME系统的某些变化减少了这种回收率的损失，例如将SLM溶剂从NPOE更改为6-十一烷酮，或通过使用具有更有利体积比的EME装置。这符合离子对假设和数学模型。对盐如何影响EME的深入研究提高了对萃取过程的理论理解，并可以为该技术的未来发展和优化做出贡献。

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